A metallic conductor and an insulator provided at an outer periphery of the metallic conductor for coating the metallic conductor constitutes an insulated wire or cable. The insulator has a reactor blended type polyolefin-based thermoplastic resin containing 51-85 mol % per monomer unit of the crystalline polypropylene. In the insulator used in a non-halogen flame retardant wire or cable, 40 to 300 pbw of a metallic hydroxide is added to 100 pbw of a blended composition. In the blended composition, the reactor blended type polyolefin-based thermoplastic resin containing 51-85 mol % per monomer unit of the crystalline polypropylene is greater than 50 pbw and less than 100 pbw, and a polyolefin is greater than 0 pbw and not greater than 50 pbw.
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